I just read that in the book Bard uses his share of the treasure to rebuild Dale

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After the death of Thorin in the Battle of Five Armies, Dain becomes King under the Mountain. He redeems the Arkenstone from Bard with a fourteenth of the treasure, which is used to re-establish Dale. Over the next three years, Bard rebuilds the city of Dale and becomes its king. The city begins to prosper again.

I wonder why they didn't depict this and if it would have been unnecessary. I think it would bring some closure to the story and a sense of redemption for the reader who naturally empathizes with the humans the most.

The restoration of Dale starts after Bilbo and Gandalf leave Erebor, though it would have been nice to see Dáin reward Bard. By the way, Bard (in the book) also gives over a portion of his gold to the rebuilding of Lake-town. The old Master falls victim to the dragon-sickness and makes off with a large part of the gold, accompanied by a number of followers. His henchmen abandon him in the Wastes where he dies alone. "I may be on the side of the angels, but do not think for one second that I am one of them." - Sherlock

...it could have illustrated how this was all part of Gandalf's plan to counter Sauron. To remove the dragon and reforge an alliance of dwarves and men in the region...which we know plays a role in the Lord of the Rings. I enjoyed obnoxious Dain, but they should have done more to redeem the character, so that we can see how he and Bard could work together to build such an alliance.

If I remember rightly, is that he isn't too tempted by the treasure. He does seem much more concerned by the plight of the people of Laketown. He does let Alfrid go with treasure without raising an eyebrow. So he does not suffer from Dragon fever.